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Central Subway

Central Subway
4th Street Portal.JPG
4th Street Portal under construction in February 2016
Overview
Type Light rail
System Muni Metro
Status Under construction
Locale San Francisco, California
Stations 4
Operation
Planned opening December 29, 2018
Owner San Francisco Municipal Transportation Agency
Operator(s) San Francisco Municipal Railway
Character Underground subway tunnel for predominantly light rail line
Technical
Line length 1.7 mi (2.74 km)
Track gauge 4 ft 8 12 in (1,435 mm)
(standard gauge)
Electrification Overhead lines, 600 V DC
Route map

The Central Subway is an extension of the Muni Metro light rail system under construction in San Francisco, California, from the Caltrain commuter rail depot at 4th and King streets to Chinatown, with stops in South of Market (SoMa) and Union Square.

The subway is the second phase of the San Francisco Municipal Transportation Agency's Third Street Light Rail Project. The first phase opened to the public as the T Third Line in 2007. The Central Subway is expected to open to the public in 2018. With the addition of the Central Subway, the T Third Line is projected to become the most heavily ridden line in the Muni Metro system by 2030.

The subway will serve major employment and population centers in San Francisco that are underserved by rapid transit. SoMa is home to the headquarters of many of San Francisco’s major software and technology companies, and substantial residential growth is projected there. Union Square, located in the city's downtown, is a primary commercial and economic district. Chinatown is the most densely populated neighborhood in the city. The Central Subway will connect these areas to communities in eastern San Francisco, including Mission Bay, Dogpatch, Bayview-Hunters Point and Visitacion Valley.

The budget to complete the Central Subway is $1.578 billion. The project is funded primarily through the Federal Transit Administration’s New Starts program. In October 2012, the FTA approved a Full Funding Grant Agreement, the federal commitment of funding through New Starts, for the Central Subway for a total amount of $942.2 million. The Central Subway is also funded by the State of California, the Metropolitan Transportation Commission, the San Francisco County Transportation Authority and the City and County of San Francisco.


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